Why would white supremacists (or black supremacists) care about this though?
The first human was basically a wild ape regardless of the continent.
When they talk about out of africa/out of europe they aren't even talking geico caveman level. They're talking about a transitional feral ape.
Most people including White supremacist posters wrongly conclude that the theory of evolution claims Whites(Caucasoids) came from Blacks(Negroids).
This latest news matters a lot to White supremacists ; Stormfront and Amren both were quick to feature this. There are posters in both, more so Stormfront, happy with this news with some saying 'they-told-you-so'. But both sites do have a few posters exhibiting caution also. They care about this because it means they don't have origins in Africa ; which they very much love to be true.
Chinese state supported scientists used to claim multi-regonalism , because they (Chinese) think they are better than everyone else. When Chinese scientists come with a paper/claim supporting multi-regionalism, the folks at Stormfront lapped it up as the truth. They would say that China is not hindered by Marxist, Liberal, PC ,Jewish influence so they can report the 'truth'. But over the past few years even the Chinese have tempered their support for multi-regionalism.
Yahoo comments section also has quite a few White supremacists happy about this.
Going off on a tangent :
It is S.O.P. for White supremacists (in general) to disavow any archaeological and anthropological news that upsets their sympathies by claiming it is just propaganda , conspiracy and lies by the liberal, marxist and Jewish media and academia. Yet this new paper is from academia and has been prominently featured by the MSM , and indeed some of the MSM even have headlines claiming OOA has been debunked.
It has been quite popular for the posters at Stormfront to claim the media , academia and government is covering up the 'truth' on Kennewick Man, yet if that were the case they would never have heard about Kennewick Man from Academia and the media.
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John Hawks cautions jumping to conclusions based on 1 mandible and upper molar.
http://johnhawks.net/weblog/fossils/miocene/graecopithecus/graecopithecus-fuss-2017.html